Buggy code:
public int getFontDelta ( ) { } public void incementFont ( ) { } public void decrementFont ( ) { } class BatchCompile implements Runnable { private AtomicInteger targetOffset ; private AtomicInteger pendingSteps ; private AtomicBoolean stopRequest ; private AtomicInteger lastActionRequest ; public static final int NOP_ACTION = 0 ; public static final int MOVE_TO_CURSOR_ACTION = 1 ; public static final int UP_DOWN_ACTION = 2 ; public static final int QUERY_ACTION = 3 ; public void resetPendingSteps ( ) { } void decrementPendingSteps ( int n ) { } public void incrementPendingSteps ( ) { } public void requestStopping ( ) { } public BatchCompile ( int targetOffset ) { } @ Override public void run ( ) { } boolean handleSteps ( ) { } boolean handleRewind ( int nofSteps ) { } boolean handleUpCursor ( ) { } boolean handleCompileToTargetPos ( ) { } public String getFileName ( String name ) { } cqDataObject getDataObject ( String filename ) { } void handleQuery ( ) { } public void requestQuery ( ) { } public void setTargetOffset ( int targetOffset ) { } } private Task batchCompileTask ; private CoqTopXMLIO coqtop ; private String dbugcontents ; private AtomicInteger compiledOffset ; private EditorCookie editor ; private boolean initialized ; private final RequestProcessor rp ; private static final Pattern coqCommandEnd = Pattern . compile ( "([^.]\\.[\\s])" ) ; private static final Pattern coqComment = Pattern . compile ( "(\\(\\*)|(\\*\\))" ) ; private cqDataObject . BatchCompile batchCompile ; private ProofError uiWindow ; private Document goal ; private Stack < Integer > offsets ; private int fontDelta = 0 ; private OffsetsBag retb ; private static final AttributeSet compiledCodeAttr = AttributesUtilities . createImmutable ( StyleConstants . Background , new Color ( 200 , 255 , 200 ) ) ; private static final AttributeSet compiledCodeAttrDark = AttributesUtilities . createImmutable ( StyleConstants . Background , new Color ( 50 , 20 , 0 ) ) ; private static final AttributeSet errorCodeAttr = AttributesUtilities . createImmutable ( StyleConstants . Background , new Color ( 255 , 100 , 100 ) ) ; private static final AttributeSet defnAttr = AttributesUtilities . createImmutable ( StyleConstants . Foreground , new Color ( 10 , 255 , 10 ) ) ; boolean lastCharIsDot ; private cqDataObject . CoqError lastError ; private static String indentStrs = "-+*" ; private FileObject fileObj ; class CoqError { public int startLoc ; public int endLoc ; public String errorMesg ; public void highlight ( ) { } } String getEntireText ( ) { } public cqDataObject ( FileObject pf , MultiFileLoader loader ) throws IOException , DataObjectExistsException { } void setKeyboardListener ( ) { } void scheduleCompilation ( ) { } void handleCompileOffsetChange ( ) { } synchronized void addToCompiledOffset ( int change ) { } synchronized void unwindOffsets ( int n ) { } void jumpToOffset ( int offset ) { } void jumpToCompileOffest ( ) { } final void initialize ( ) { } public class InsertStringActionListener implements ActionListener { String str ; public InsertStringActionListener ( String str ) { } @ Override public void actionPerformed ( ActionEvent ae ) { } } public class InsertAndCompileActionListener implements ActionListener { String str ; public InsertAndCompileActionListener ( String str ) { } @ Override public void actionPerformed ( ActionEvent ae ) { } } public StyledDocument getDocument ( ) { } void updateGoal ( ) { } void insertStringAtCursor ( String str ) { } void insertStringAndCompile ( int startIndex , String str ) { } void insertStringAtCursorAndCompile ( String str ) { } void insertStringAtCompiledOffsetAndCompile ( String str ) { } int getOffsetToSend ( ) { } boolean compileStep ( ) { } void handleDownButton ( ) { } void handleQuery ( ) { } void handleCompileToOffset ( int offset ) { } void handleDownToCursor ( ) { } void handleUpButton ( ) { } void handleUppButton ( ) { } void handleBottomButton ( ) { } int rewindCoqtop ( int nofSteps ) { } void rewindCoqtopForQuery ( ) { } DebugUnivInconst dbgC ; void showTopUnivs ( ) { } static String readFile ( String path ) throws IOException { } void SyntaxHighlight ( ) { FileObject glob = fileObj . getParent ( ) . getFileObject ( fileObj . getName ( ) , "glob" ) ; try { String globContents = cqDataObject . readFile ( glob . getPath ( ) ) ; String [ ] lines = globContents . split ( "\n" ) ; for ( String line : lines ) { if ( line . startsWith ( "R" ) ) { line = line . substring ( 1 ) ; int colonIndex = line . indexOf ( ":" ) ; int spaceIndex = line . indexOf ( "<seq2seq4repair_space>" ) ; if ( ( 0 < colonIndex ) && ( colonIndex < spaceIndex ) ) { int startIndex = Integer . parseInt ( line . substring ( 0 , colonIndex ) ) ; int endIndex = Integer . parseInt ( line . substring ( ( colonIndex + 1 ) , spaceIndex ) ) ; String [ ] words = line . split ( "<seq2seq4repair_space>" ) ; String lastWord = words [ ( ( words . length ) - 1 ) ] ; if ( lastWord . startsWith ( "def" ) ) <START_BUG> retb . addHighlight ( startIndex , endIndex , cqDataObject . defnAttr ) ; <END_BUG> } } } } catch ( IOException ex ) { JOptionPane . showMessageDialog ( uiWindow , "could<seq2seq4repair_space>not<seq2seq4repair_space>read<seq2seq4repair_space>glob<seq2seq4repair_space>file" ) ; } } void debugUnivInconsistency ( ) { } boolean keyListenerAssigned ; final void assignCookie ( ) { } @ Override protected int associateLookup ( ) { } cqDataObject getThisDataObject ( ) { } void getContents ( ) { } @ MultiViewElement . Registration ( displayName = "#LBL_cq_EDITOR" , iconBase = "coq//1372847281_ok_16x16.gif" , mimeType = "text//coq" , persistenceType = TopComponent . PERSISTENCE_ONLY_OPENED , preferredID = "cq" , position = 1000 ) @ Messages ( "LBL_cq_EDITOR=Source" ) public static MultiViewEditorElement createEditor ( Lookup lkp ) { } }

Fix:
retb . addHighlight ( startIndex , ( endIndex + 1 ) , cqDataObject . defnAttr ) ;